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This research did not receive any external funding.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Funding"}},{"value":"The authors declare that there is no conflict of interest.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of Interest"}},{"value":"The local ethics committee has approved the study (Ethics Committee of the Friedrich-Alexander-Universit\u00e4t Erlangen-N\u00fcrnberg, Germany, code 561_20 Bc). 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